An issue in the YAML Python library of NASA AIT-Core v2.5.2 allows attackers to execute arbitrary commands via supplying a crafted YAML file.

A vulnerability was discovered in the PyYAML library, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the fullload method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. An attacker could use this flaw to execute arbitrary code on the system by abusing the python/object/apply constructor.

In PyYAML before 4.1, the yaml.load() API could execute arbitrary code. In other words, yaml.safeload is not used.